CN117700596A - Emulsion drag reducer for oil and gas field and preparation method thereof - Google Patents
Emulsion drag reducer for oil and gas field and preparation method thereof Download PDFInfo
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- CN117700596A CN117700596A CN202311790982.4A CN202311790982A CN117700596A CN 117700596 A CN117700596 A CN 117700596A CN 202311790982 A CN202311790982 A CN 202311790982A CN 117700596 A CN117700596 A CN 117700596A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 67
- 239000000839 emulsion Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 239000003999 initiator Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- YBDBTBVNQQBHGJ-UHFFFAOYSA-N 1,2,3,4,5-pentafluoro-6-prop-2-enylbenzene Chemical compound FC1=C(F)C(F)=C(CC=C)C(F)=C1F YBDBTBVNQQBHGJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- MAGFQRLKWCCTQJ-UHFFFAOYSA-N 4-ethenylbenzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=C(C=C)C=C1 MAGFQRLKWCCTQJ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- RAEPTYMQPZQCMG-UHFFFAOYSA-N COC1=CC=C([SiH3])C=C1 Chemical compound COC1=CC=C([SiH3])C=C1 RAEPTYMQPZQCMG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims abstract description 13
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims abstract description 13
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 13
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims abstract description 13
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 13
- 239000012153 distilled water Substances 0.000 claims abstract description 12
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 11
- 239000000337 buffer salt Substances 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 239000007789 gas Substances 0.000 claims description 46
- 239000000243 solution Substances 0.000 claims description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 8
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 6
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 6
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims description 5
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 5
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 5
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 claims description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 4
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 4
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 3
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 3
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 2
- WMBFARVSOWVDII-UHFFFAOYSA-N 20-ethenyl-2,5,8,11,14,17-hexaoxabicyclo[16.4.0]docosa-1(18),19,21-triene Chemical compound O1CCOCCOCCOCCOCCOC2=CC(C=C)=CC=C21 WMBFARVSOWVDII-UHFFFAOYSA-N 0.000 claims 1
- 238000004321 preservation Methods 0.000 abstract description 10
- 238000010008 shearing Methods 0.000 abstract description 7
- 239000006227 byproduct Substances 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 31
- 239000012530 fluid Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 10
- 239000000178 monomer Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- -1 allyl dimethyl (4-methoxyphenyl) silane Chemical compound 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 2
- 235000019838 diammonium phosphate Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012688 inverse emulsion polymerization Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- Polymerisation Methods In General (AREA)
Abstract
The invention belongs to the technical field of petroleum exploitation, and particularly relates to an emulsion drag reducer for an oil-gas field and a preparation method thereof. The preparation method comprises the following steps: sequentially adding allylpentafluorobenzene, p-styrenesulfonic acid, 4-vinylbenzo-18-crown ether-6, allyldimethyl (4-methoxyphenyl) silane, span 60, sodium dodecyl sulfate, hydroxyethyl cellulose, buffer salt and distilled water into a reaction kettle, and adjusting the pH to 7-8; and (3) dropwise adding an initiator into the reaction kettle, heating, carrying out heat preservation reaction until the solution starts to become viscous, continuing the reaction, heating, carrying out heat preservation reaction, cooling to below 40 ℃, and regulating the pH value to 7-8 to obtain the emulsion drag reducer for the oil-gas field. The invention has the advantages of simple synthesis process and no byproducts; meanwhile, the invention has the characteristics of high apparent viscosity, high shearing resistance and high drag reduction rate.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to an emulsion drag reducer for an oil-gas field and a preparation method thereof.
Background
With the increasing consumption of petroleum and natural gas in China, the autonomous supply capability of oil and gas is insufficient, the external dependence is continuously improved, and the energy safety in China is seriously affected. The unconventional oil gas resource is taken as an important component of clean energy, and is an important content for adjusting the energy structure in China. Currently, one of the core technologies of unconventional oil and gas production is the fracturing technology.
The fracturing technology is that after the fracturing fluid is pressurized by high-pressure pump injection equipment, the fracturing fluid is pumped into stratum at high speed through a pipe column, turbulence phenomenon of the fluid in the pipe flowing process is serious under the condition of high pressure and high speed, larger friction resistance exists between the fracturing fluid and the pipe wall, the friction resistance of the fluid limits the flow of the fluid in a pipeline, and the pipeline transmission capacity is reduced and the energy loss is increased. Therefore, there is a need to reduce the effects of frictional resistance by adding drag reducers to the fluid, thereby improving the efficiency of construction.
The drag reducer is used as a core component of the slickwater fracturing fluid, and has the function of reducing pumping friction in the construction process, so that the discharge capacity is improved as much as possible, and meanwhile, the load and high-pressure risk of equipment are reduced, and the safe construction is realized. The performance of the drag reducer directly determines the success or failure of the horizontal well fracturing construction, and the development of the high-efficiency drag reducer has become one of core technologies of unconventional oil and gas exploitation fracturing. During turbulence, polymer coils can stretch significantly in the direction of flow, resulting in a sudden increase in extensional viscosity, a phenomenon that is believed to be a significant cause of drag reduction.
CN103694984a discloses a shale gas acid fracturing drag reducer and a preparation method thereof. The method comprises the steps of mixing monomer acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, dissolving in water, adding acrylamide, and finally adding disodium ethylenediamine tetraacetate to prepare a water phase; mixing and dissolving the compound surfactant and the base oil to form an oil phase; and then carrying out inverse emulsion polymerization on the oil phase and the water phase to prepare the shale gas acidizing fracturing drag reducer. The drag reducer is introduced with a large amount of acid-resistant monomers, so that the acid-resistant capacity of the drag reducer is greatly improved; the drag reducer is milky emulsion in appearance, high in stability, non-flammable, non-explosive and safe in transportation and storage; the drag reducer is fast to dissolve in water, does not form fish eyes, and meets the requirement of continuous mixing of shale gas acidizing and fracturing; the drag reducer aqueous solution with the mass fraction of 0.2 percent can reach more than 70 percent. The drag reducer is prepared by an inverse emulsion method, and the inverse emulsion contains a large amount of organic solvents, so that the drag reducer for the fracturing fluid can cause pollution of underground water after being injected into a stratum, cause environmental injury and can not meet the requirement of environmental protection.
CN105885816a discloses a novel drag reducer for fracturing, in particular to a drag reducer for fracturing fluid used in petroleum fracturing construction. The novel drag reducer for fracturing provided by the invention can reduce the flow resistance in a turbulent flow state by adding a small amount of the drag reducer into the fluid. The highest drag reduction rate can reach 79.5 percent. The drag reducer can only maintain 79.4% of drag reduction rate after 5h shearing, and the shearing resistance is required to be further improved.
Disclosure of Invention
The invention provides an emulsion drag reducer for an oil-gas field and a preparation method thereof aiming at the defects of the prior art. The invention has the advantages of simple synthesis process and no byproducts; meanwhile, the invention has the characteristics of high apparent viscosity, high shearing resistance and high drag reduction rate.
To achieve the above object:
one of the purposes of the invention discloses an emulsion drag reducer for an oil and gas field, which has the following molecular structural formula:
wherein:
a＝10000-100000；
b＝3000-60000；
c＝1000-20000；
d＝1000-20000。
preferably, the viscosity average molecular weight of the emulsion drag reducer for oil and gas fields is 10000000-20000000.
The invention further discloses a preparation method of the emulsion drag reducer for the oil and gas field, which comprises the following specific steps:
(1) Sequentially adding allylpentafluorobenzene, p-styrenesulfonic acid, 4-vinylbenzo-18-crown ether-6, allyldimethyl (4-methoxyphenyl) silane, span 60, sodium dodecyl sulfate, hydroxyethyl cellulose, buffer salt and distilled water into a reaction kettle, adding a sodium hydroxide solution while stirring, and adjusting the pH to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 5-10min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. Dropwise adding an initiator into the reaction kettle, heating to 60-65 ℃ after the dropwise adding is finished, keeping the temperature for reaction until the solution starts to become viscous, continuing the reaction for 30-50min, then heating to 80-85 ℃, keeping the temperature for reaction for 30-60min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for the oil and gas field.
Preferably, the molar ratio of the p-styrenesulfonic acid, the 4-vinylbenzo-18-crown ether-6, the allyldimethyl (4-methoxyphenyl) silane and the allylpentafluorobenzene is 0.3-0.6:0.1-0.2:0.1-0.2:1.
preferably, in the step (1), the weight ratio of span 60, sodium dodecyl sulfate, hydroxyethyl cellulose, buffer salt, distilled water and allylpentafluorobenzene is 0.2-0.4:0.1-0.2:0.5-1:0.1-0.2:8-10:1.
preferably, in the step (1), the buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate.
More preferably, the buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate and disodium hydrogen phosphate.
Preferably, in the step (2), the initiator is a mixed solution of persulfate and sodium bisulfite, wherein the concentration of the persulfate is 10-12wt% and the concentration of the sodium bisulfite is 5-6wt%; the weight ratio of the initiator to the allylpentafluorobenzene is 0.3-0.6:1.
more preferably, the persulfate is one of potassium persulfate, ammonium persulfate and sodium persulfate.
The emulsion drag reducer for oil and gas fields has the following synthesis reaction equation:
the emulsion drag reducer for the oil and gas field is a quaternary high polymer taking allylpentafluorobenzene, p-styrenesulfonic acid, 4-vinylbenzo-18-crown ether-6 and allyldimethyl (4-methoxyphenyl) silane as monomers. The allyl pentafluorobenzene, the 4-vinylbenzo-18-crown ether-6 and the allyl dimethyl (4-methoxyphenyl) silane belong to special surfactant monomers, have low surface tension and interface tension which are incomparable with those of common surfactants, and can greatly reduce the friction resistance in the transportation process of the fracturing fluid; the p-styrenesulfonic acid belongs to an anionic surfactant monomer, so that the surface tension and the interfacial tension can be greatly reduced, and the friction resistance in the transportation process of the fracturing fluid can be reduced; the allyl pentafluorobenzene, p-styrenesulfonic acid, 4-vinylbenzo-18-crown ether-6 and allyl dimethyl (4-methoxyphenyl) silane all contain benzene rings in the molecules, belong to rigid monomers and have very strong shearing resistance. span 60 and sodium dodecyl sulfate are nonionic and anionic emulsifying agents, and hydroxyethyl cellulose belongs to an emulsifying dispersing agent, so that the polymerization quality of a product can be improved, the molecular weight and the uniformity degree can be improved, the viscosity of the product can be improved, and the drag reduction effect can be further enhanced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The emulsion drag reducer for the oil and gas field is synthesized into a one-pot method, raw materials are easy to obtain, byproducts are avoided, and the method is safe and environment-friendly;
(2) The emulsion drag reducer for the oil and gas field has the characteristic of high apparent viscosity, and the apparent viscosity of 0.5 weight percent concentration reaches 135mPa.s at most;
(3) The emulsion drag reducer for the oil and gas field has strong shearing resistance, continuously shears for 8 hours at 170S-rotating speed, and the viscosity retention rate is up to 95.1%;
(4) The emulsion drag reducer for the oil and gas field has good drag reduction effect, and the maximum drag reduction rate of 0.5wt% concentration reaches 76%.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments:
example 1
(1) 0.1mol of allylpentafluorobenzene, 0.03mol of p-styrenesulfonic acid, 0.02mol of 4-vinylbenzo-18-crown ether-6, 0.02mol of allyldimethyl (4-methoxyphenyl) silane, 4.16g of span 60, 3.44g of sodium dodecyl sulfate, 10.4g of hydroxyethyl cellulose, 3.14g of potassium dihydrogen phosphate and 166.4g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 5min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. And (3) dropwise adding 6.24g of an initiator into the reaction kettle, wherein the initiator contains 12wt% of potassium persulfate and 6wt% of sodium bisulfate, heating to 60 ℃ after the dropwise addition is finished, carrying out heat preservation reaction until the solution starts to become viscous, continuing the reaction for 50min, then heating to 82 ℃, carrying out heat preservation reaction for 30min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for oil and gas fields.
Example 2
(1) 0.1mol of allylpentafluorobenzene, 0.035mol of p-styrenesulfonic acid, 0.018mol of 4-vinylbenzo-18-crown ether-6, 0.02mol of allyldimethyl (4-methoxyphenyl) silane, 5.17g of span 60, 4.16g of sodium dodecyl sulfate, 12.3g of hydroxyethyl cellulose, 3.88g of dipotassium hydrogen phosphate and 172.3g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 6min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. 7.18g of initiator is dripped into the reaction kettle, the initiator contains 10wt% of potassium persulfate and 5wt% of sodium bisulphite, the temperature is raised to 65 ℃ after the dripping is finished, the reaction is kept at the temperature until the solution starts to become sticky, the reaction is continued for 40min, the temperature is raised to 84 ℃, the reaction is kept at the temperature for 60min, the temperature is reduced to below 40 ℃, and the pH value is regulated to 7-8 by using sodium hydroxide solution, so that the emulsion drag reducer for oil and gas fields is obtained.
Example 3
(1) 0.1mol of allylpentafluorobenzene, 0.04mol of p-styrenesulfonic acid, 0.016mol of 4-vinylbenzo-18-crown ether-6, 0.015mol of allyldimethyl (4-methoxyphenyl) silane, 5.88g of span 60, 2.08g of sodium dodecyl sulfate, 16.8g of hydroxyethyl cellulose, 4.16g of disodium hydrogen phosphate and 182g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 5min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. And (3) dropwise adding 8.66g of an initiator into the reaction kettle, wherein the initiator contains 11wt% of potassium persulfate and 6wt% of sodium bisulfate, heating to 61 ℃ after the completion of dropwise adding, carrying out heat preservation reaction until the solution starts to become viscous, continuing the reaction for 35min, then heating to 83 ℃, carrying out heat preservation reaction for 40min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for oil and gas fields.
Example 4
(1) 0.1mol of allylpentafluorobenzene, 0.045mol of p-styrenesulfonic acid, 0.015mol of 4-vinylbenzo-18-crown ether-6, 0.015mol of allyldimethyl (4-methoxyphenyl) silane, 6.3g of span 60, 2.94g of sodium dodecyl sulfate, 14.8g of hydroxyethyl cellulose, 2.08g of sodium dihydrogen phosphate and 175g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 5min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. 9.42g of initiator is dripped into the reaction kettle, the initiator contains 12wt% of sodium persulfate and 5wt% of sodium bisulphite, the temperature is heated to 62 ℃ after the dripping is finished, the reaction is kept at the temperature until the solution starts to become viscous, the reaction is continued for 45min, the temperature is then increased to 82 ℃, the reaction is kept at the temperature for 50min, the temperature is reduced to below 40 ℃, and the pH value is regulated to 7-8 by using sodium hydroxide solution, so that the emulsion drag reducer for oil and gas fields is obtained.
Example 5
(1) 0.1mol of allylpentafluorobenzene, 0.05mol of p-styrenesulfonic acid, 0.013mol of 4-vinylbenzo-18-crown ether-6, 0.012mol of allyldimethyl (4-methoxyphenyl) silane, 7.14g of span 60, 3.47g of sodium dodecyl sulfate, 20.8g of hydroxyethyl cellulose, 2.74g of disodium hydrogen phosphate and 204g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 8min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. And (3) dropwise adding 10.33g of an initiator into the reaction kettle, wherein the initiator contains 12wt% of sodium persulfate and 6wt% of sodium bisulfate, heating to 63 ℃ after the completion of dropwise adding, carrying out heat preservation reaction until the solution starts to become viscous, continuing the reaction for 30min, then heating to 81 ℃, carrying out heat preservation reaction for 35min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for oil and gas fields.
Example 6
(1) 0.1mol of allylpentafluorobenzene, 0.055mol of p-styrenesulfonic acid, 0.0111 mol of 4-vinylbenzo-18-crown ether-6, 0.01mol of allyldimethyl (4-methoxyphenyl) silane, 7.88g of span 60, 3.88g of sodium dodecyl sulfate, 19.2g of hydroxyethyl cellulose, 3.44g of ammonium dihydrogen phosphate and 208g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 7min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. 11.68g of initiator is dripped into the reaction kettle, the initiator contains 11wt% of ammonium persulfate and 6wt% of sodium bisulphite, the temperature is raised to 64 ℃ after the dripping is finished, the reaction is kept at the temperature until the solution starts to become viscous, the reaction is continued for 40min, the temperature is raised to 80 ℃, the reaction is kept at the temperature for 45min, the temperature is reduced to below 40 ℃, and the pH value is regulated to 7-8 by using sodium hydroxide solution, so that the emulsion drag reducer for oil and gas fields is obtained.
Example 7
(1) 0.1mol of allylpentafluorobenzene, 0.06mol of p-styrenesulfonic acid, 0.01mol of 4-vinylbenzo-18-crown ether-6, 0.012mol of allyldimethyl (4-methoxyphenyl) silane, 8.32g of span 60, 3.9g of sodium dodecyl sulfate, 18.6g of hydroxyethyl cellulose, 3.6g of diammonium hydrogen phosphate and 198g of distilled water are sequentially added into the reaction kettle, and a sodium hydroxide solution is added while stirring, so that the pH value is regulated to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 10min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible. And (3) dropwise adding 12.48g of an initiator into the reaction kettle, wherein the initiator contains 10wt% of ammonium persulfate and 6wt% of sodium bisulphite, heating to 65 ℃ after the dropwise addition is finished, carrying out heat preservation reaction until the solution starts to become viscous, continuing the reaction for 45min, then heating to 85 ℃, carrying out heat preservation reaction for 53min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for oil and gas fields.
Example 8 apparent viscosity test
Testing apparent viscosity μ of emulsion drag reducers for oil and gas fields (examples 1-7) of the present invention 0 The test concentration is 0.5wt%, and the test method is referred to SY/T6376-2008 general technical Condition for fracturing fluids.
Apparent viscosity comparisons were made with Puyang, sea, source chemical industry Co., ltd, and the test results are shown in Table 1.
As can be seen from table 1: apparent viscosity μ of emulsion drag reducer for oil and gas field of the present invention (examples 1 to 7) at use concentration of 0.5wt% 0 All greater than 120mPa.s and up to 135mPa.s, while the apparent viscosity μ of the emulsion drag reducer of comparative example Puyang sea, inc. of source chemical industry Utility Co., ltd 0 64mPa.s, significantly lower than the invention.
Example 9 shear resistance test
The emulsion drag reducer for oil and gas field of the present invention (examples 1 to 7) was tested for shear resistance by referring to SY/T5107-2005 Water-based fracturing fluid evaluation method, sample of example 8 was tested at 170S - Continuously shearing for 8 hours at the rotating speed, and testing the appearanceViscosity mu 1 The viscosity retention was calculated.
η＝μ 1 /μ 0 ×100％
Viscosity retention ratio comparison was performed with an emulsion drag reducer from source chemical industry Co., ltd. In Puyang, sea, and the test results are shown in Table 1.
As can be seen from table 1: the emulsion drag reducer for oil and gas fields (examples 1-7) is continuously sheared for 8 hours at 170S-rotating speed, the viscosity retention rate is more than 90%, and the maximum reaches 95.1%; the viscosity retention of the comparative example Puyang sea's emulsion drag reducer was 40.6%, which is significantly lower than the present invention.
Example 10 drag reduction rate test
The emulsion drag reducer for oil and gas field of the present invention (examples 1 to 7) was tested for drag reduction ratio at 0.3wt% and 0.5wt% in the test method referred to SY/T6376-2008 general technical conditions for fracturing fluids.
Drag reduction ratio comparison was performed with an emulsion drag reducer from source chemical industry Co., ltd. In Puyang, sea, and the test results are shown in Table 1.
TABLE 1 apparent viscosity, shear resistance, drag reduction test results
As can be seen from table 1:
(1) The emulsion drag reducer for oil and gas fields (examples 1-7) has the drag reduction rate of 65% or more and 69% at the use concentration of 0.3wt%, and the emulsion drag reducer for the source chemical industry Co., ltd. In the Puyang city of comparative example has the drag reduction rate of 57% and is obviously lower than that of the invention;
(2) The emulsion drag reducer for oil and gas field of the present invention (examples 1-7) has a drag reduction ratio of more than 70% and up to 76% at a concentration of 0.5wt%, while the emulsion drag reducer of the comparative example, puyang, sea, source chemical industry Co., ltd, has a drag reduction ratio of 61%, which is significantly lower than the present invention.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (10)
1. The preparation method of the emulsion drag reducer for the oil and gas field is characterized by comprising the following specific steps of:
(1) Sequentially adding allylpentafluorobenzene, p-styrenesulfonic acid, 4-vinylbenzo-18-crown ether-6, allyldimethyl (4-methoxyphenyl) silane, span 60, sodium dodecyl sulfate, hydroxyethyl cellulose, buffer salt and distilled water into a reaction kettle, adding a sodium hydroxide solution while stirring, and adjusting the pH to 7-8;
(2) The reaction kettle and the pipeline are purged by nitrogen for 5-10min, the nitrogen atmosphere is maintained in the whole synthesis process, and the contact with air is avoided as much as possible; dropwise adding an initiator into the reaction kettle, heating to 60-65 ℃ after the dropwise adding is finished, keeping the temperature for reaction until the solution starts to become viscous, continuing the reaction for 30-50min, then heating to 80-85 ℃, keeping the temperature for reaction for 30-60min, cooling to below 40 ℃, and regulating the pH value to 7-8 by using a sodium hydroxide solution to obtain the emulsion drag reducer for the oil and gas field.
2. The method for preparing the emulsion drag reducer for oil and gas fields according to claim 1, wherein the molar ratio of the p-styrenesulfonic acid, the 4-vinylbenzo-18-crown-6, the allyldimethyl (4-methoxyphenyl) silane and the allylpentafluorophenyl is 0.3-0.6:0.1-0.2:0.1-0.2:1.
3. the method for preparing emulsion drag reducer for oil and gas field according to claim 1, wherein in the step (1), the weight ratio of span 60, sodium dodecyl sulfate, hydroxyethyl cellulose, buffer salt, distilled water and allylpentafluorobenzene is 0.2-0.4:0.1-0.2:0.5-1:0.1-0.2:8-10:1.
4. the method for producing emulsion drag reducer for oil and gas field according to claim 1, wherein in the step (1), the buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, ammonium dihydrogen phosphate and ammonium dihydrogen phosphate.
5. The method for producing emulsion drag reducer for oil and gas field according to claim 4, wherein said buffer salt is one of potassium dihydrogen phosphate, dipotassium hydrogen phosphate and disodium hydrogen phosphate.
6. The method for producing emulsion drag reducer for oil and gas field according to claim 1, wherein in the step (2), the initiator is a mixed solution of persulfate and sodium bisulphite, wherein the concentration of persulfate is 10-12wt% and the concentration of sodium bisulphite is 5-6wt%.
7. The method for producing an emulsion drag reducer for oil and gas fields according to claim 1 or 6, wherein the weight ratio of the initiator to allylpentafluorobenzene is 0.3-0.6:1.
8. the method for producing emulsion drag reducer for oil and gas field according to claim 6, wherein the persulfate is one of potassium persulfate, ammonium persulfate and sodium persulfate.
9. An emulsion drag reducer for an oil and gas field, characterized in that the emulsion drag reducer for an oil and gas field has the following molecular structural formula:
wherein:
a＝10000-100000；
b＝3000-60000；
c＝1000-20000；
d＝1000-20000。
10. the emulsion drag reducer for oil and gas fields as claimed in claim 9, wherein said drag reducer has a viscosity average molecular weight of 10000000-20000000.
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